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After 27 empty drug packets were found by police in Jutting’s apartment, Dr Lau said it showed “extremely heavy use”, adding: “10 grams at this concentration would be normal to three grams of [high purity] cocaine.

“It has been reported that people can consume that dose without fatality.”

Torture kit

In one of his video diaries, Jutting revealed he has spent $1m (£650,000) in just two years on "prostitutes and drugs".

Jutting killed mum-of-one Ms Ningsih, 23, during the early hours of October 27, 2014, whom he held captive while taking sickening photographs as he degraded and eventually killed her.

Among the 76 photographs found on Jutting’s iPhone was showing him “holding up" Ms Ningsih's head after cutting her throat.

Jutting recorded a series of video diaries detailing his spree (Image: Reuters)

He spent the next week high on cocaine, recording hours of rambling video monologues while planning the gruesome torture of another sex worker.

Five days later, he picked up his second victim, 26-year-old Seneng Mujiasih, only to kill her within 45 minutes after she saw his "torture kit" and screamed.

Ms Ningsih's body was found stuffed in a suitcase on the balcony of Jutting's 31st floor flat.